Re: "International" email addresses

On 11/19/2014 11:37 AM, Shawn Steele wrote:
>
> Validating the IDN part is much more complicated than validating the 
> local part, because you need to know the IDN rules.  Which means it 
> probably isn’t just a “simple” regex.
>

IDN rules are different for each zone. They are currently described in 
ways that make it difficult to validate them mechanically.

There's a proposed XML schema that would allow arbitrary sets of IDN 
rules to be expressed in a common machine-readable format that allows 
mechanical validation.

The schema is not without its complexities, but as far as we can tell 
allows one to express all existing specifications (as well as the 
planned rules for the Root Zone).

Details here: https://datatracker.ietf.org/doc/draft-davies-idntables/

A./
>
> So maybe the rule should allow Unicode in the domain part and 
> encourage complete IDN validation as an additional step?
>
> -Shawn
>
> *From:*jshin1987@gmail.com [mailto:jshin1987@gmail.com] *On Behalf Of 
> *Jungshik SHIN (???)
> *Sent:* Wednesday, November 19, 2014 10:53 AM
> *To:* Shawn Steele
> *Cc:* Anne van Kesteren; Steven Pemberton; www-international@w3.org; 
> Forms WG
> *Subject:* Re: "International" email addresses
>
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=15489 deals with it 
> (EAI support in email form validation) although the summary is a bit 
> misleading (it only talks about IDN).
>
> Jungshik
>
> On Wed, Nov 19, 2014 at 10:07 AM, Shawn Steele 
> <Shawn.Steele@microsoft.com <mailto:Shawn.Steele@microsoft.com>> wrote:
>
>     Updating that to support EAI would be good.
>
>
>     -----Original Message-----
>     From: annevankesteren@gmail.com <mailto:annevankesteren@gmail.com>
>     [mailto:annevankesteren@gmail.com
>     <mailto:annevankesteren@gmail.com>] On Behalf Of Anne van Kesteren
>     Sent: Wednesday, November 19, 2014 2:07 AM
>     To: Steven Pemberton
>     Cc: www-international@w3.org <mailto:www-international@w3.org>;
>     Forms WG
>     Subject: Re: "International" email addresses
>
>     On Wed, Nov 19, 2014 at 11:00 AM, Steven Pemberton
>     <Steven.Pemberton@cwi.nl <mailto:Steven.Pemberton@cwi.nl>> wrote:
>     > So as far as I can see, an internationalised email address is:
>     >
>     >  address: atom-list "@" atom-list.
>     >  atom-list: atom ( "." atom )*
>     >  atom: C+
>     >  C: any character in the world EXCEPT (),.:;<>@[\]
>     >
>     > a) Do you agree?
>     > b) It was really hard to find this out. The internet is rife with
>     > people asking and getting bad answers. Please help the internet by
>     > being definitive.
>
>     I recommend matching HTML's definition:
>
>     https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address
>
>
>     --
>     https://annevankesteren.nl/
>